The first time I clicked the Finish button with some tables selected as shown in the screen shot in figure 1 and got an “unspecified error”
the second time I tried I with no tables selected and clicked the Finish button and got “Operation is not allowed when object is open” as shown in figure 2.toadmodelererror1.doc (218 KB)

Please ignore my earlier post. Here is the error I am getting now after making the change “Microsoft OLE DB Provider for Oracle” using ADO. I did a test connection with the ADO and get the following error message -
“Test connection failed because of error initializing provider. ORA-12154. TNS:could not resolve service name.”
Details in attached screenshot.toadmodelererror2.doc (108 KB)